From: slavotinek@gmail.com   
      
   On 09.01.2023 16:01, Pertti Helander wrote:   
   > I checked again PSU with multimeter and PSU line cabel connected. Between   
   PSU pin 1-2 it was 5 V.   
      
   That's correct for a stand-by mode.   
      
   > Line cabel connected between PSU pins 5-3,5-4,5-7 and 5-16 were 0,1-0,2V   
   each so is PSU broken.   
      
   This was with 1-2 shorted right? The weak 5 V level on pin 1 must be   
   tied to ground (0 V, pin 2) to start the rest of the PSU. Otherwise   
   there is no voltage on the other rails.   
      
   If you still get 0 on the other pin pairs, the PSU is indeed bad.   
      
   > Is there any fuses inside PSU?   
      
   There is usually at least one traditional fuse - on the primary side of   
   the unit. Though, if this fuse is open, there is most likely some other   
   fault in the PSU. An over-current condition (short) external to the PSU   
   will not cause the fuse to blow.   
      
   > Is it possible and safe to open it and check?   
      
   Leave the PSU unplugged for a day before opening it. And even then be   
   careful when poking inside the unit - the caps can hold a significant   
   charge for quite some time (there are usually bleed resistors to   
   discharge the caps, but never rely on that).   
      
   > And I find it difficult to switch back PSU socket to planar socket.   
      
   There is always some insertion friction, but if it doesn't feel right,   
   you should inspect what's going.   
      
   > PSU socket is lose and moves horizontal and vertical and can´t see how it   
   hits to planar socket.   
      
   That's normal. The plug on the PSU side is floating to compensate for   
   manufacturing/assembly tolerances. The used connector is self-aligning.   
      
   > And PSU can also be moved horizantally within hinges.   
      
   That's also normal. Though, there should be a grounding strap on the   
   front hinge, limiting the movement significantly (not sure if all   
   machines have this).   
      
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